.father{
    width: 1000px;
    height: auto;
    position: relative;
    margin: 100px auto;
}
table{
    width: 1000px;
    height: auto;
    text-align: center;
    border-spacing: 0px;
}

table,tr,th{
    border: 2px solid rgba(0,0,0,0.4);
    background-color: rgb(170,200,200);
}
td{
    border: 2px solid rgba(0,0,0,0.4);
    padding: 5px;
    font-size: 12px;
    font-weight: bold;
    color: rgb(80,100,120);
}
#add{
    position: absolute;
    right: 0;
}
#back{
    display:none;
}